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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '719beaeff88697ec3f2e0b21088b425434ec1d787d40ce10cb9bad4872507051' 
  AND token = 'xu8p1zDWtzvRkT1SMeewbMMgO0X1L5Okx8dN6wabsZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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