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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62777a0b7e3ceb020902f5b4d2e2f61239e284287f141f9f51eb02a5db6ce3e5' 
  AND token = 'RRfRGF1QaopfULBon+a2I252gvb6ZEgXpbwmPAxplS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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