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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf345e0b13dd2095ef39f48e308bf94eb81a17b0cab5c34f0fc8d7cde802de6d' 
  AND token = 'FpSdKce8cG/OFpYtOCQt1t81Qx0fjPlkDj4wZdwVeDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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