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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87637fe6b6531df41ba12f3adffee73b94a1aefe43aabd372d6f484401aaed57' 
  AND token = '20yVg1IElaxeNZ9YSP61njy565GRbM5tDyS1pB+3zNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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