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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f622bb0b25d77ee4b97e6d1bf4edc8e8ada53cd88c11678afefcec371288c27' 
  AND token = 'f37/qH4KdvIsPG3PdUwL//qt7ELElIkKGdmnCXicRvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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