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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '687332b7a37553f30a3c20e7f62187ee28c96e36b94a5844a86fdd41c1cbfe76' 
  AND token = 'fZa1W76sGM75jPYQUKAIVdOUBifkKKsXyWRavg4faug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}