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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '320967fcbe3da38b2ad398d43ae3f83a1bffb56bbda699fa89aa63aca34bad0b' 
  AND token = 'H7kb9ZbzC2cJvFs6b2BXfDGf2iO7MXRABBntblO4x0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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