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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ad365f43cdf7032b2878232f94c807f8d643445e250c9ff99d390dfa06275d' 
  AND token = '0GyPNDMmrnCbORAjh0vbeN878U5i0giBqSmCVFpicnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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