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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f1193cc72623899cadbe2e387b25fb67c5997235a533645d673bdc4f584fb03' 
  AND token = '6jH6e66JPwLf2bxnypdEcJwAcddQVa6y5xgUGU2B3hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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