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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec314e2380ef3f07037d9eea17be830d0bb0b2452b59fe6b5c8eed464be13282' 
  AND token = 'bMmvstgBaVTmZmPeq7MUmBzx0prGRZmkg85YNM9ajqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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