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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82187c8cf9bf0095cf87e1d4a40fa776242596e80c181ab0782ff80ad6dc1fbd' 
  AND token = 'otDb+ThQmYs1ENGECysP30Ja8nokMZTWrACZmSxWX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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