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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76d4e326f76069e56ade5985c718b43be4e9593fa71b3e4182e44443300ef565' 
  AND token = 'ghB7W1Khv4Og6DxpqS8I8rUvARsyYcH3MTo1nM7lXD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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