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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7ac3982b5dd58663d353d5d1d6248f427d894741fb6b79fc754ef99e9427183' 
  AND token = 's0c6oeW8Aog0YKM8QP481To65MF0dmPdUeQKrTsbgTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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