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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97cc0ef8d3b777ad6f096b72152621a6e425fea02cda088f581b32cddabbeb33' 
  AND token = 'nBzp6NvdVAp4SsTOvYafJhweHz+hUFoJJ09S0JE8yic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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