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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0a03b7a2e6917d01f644e0a6186d74802e3158e636b707ee9e0e3172242ce82' 
  AND token = 'Db31uzU239Ewiw5d3HntzD3F7lNui1xeaDaAEQKxj+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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