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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb47b693fa65cfa86ba891d06591e408af1473692f9a1db3e9195acbdf69eddb' 
  AND token = 'cl77t1VCbb9vEdxVZX5IqgrUcoAA2idMs4JT38OAt4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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