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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e566047321d971d405f0636c373a1a8dcfe797b086a3c75935881ba6fb73617' 
  AND token = 'OV6AUKw4tEoOiAAywXR7sP0FCEhekmUF2VsCT40Wt4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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