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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '377fb1d87d7ff3c8117f5c11ef06d3f5c33bf4ce7943bf91f97d1b2dd8a5c371' 
  AND token = 'ml+XuvLc0aahfoy26gpQi8H2SX6gzAn7Ap+tFbY31Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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