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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eb56e75cc20bb621f95c96459d0ea108930ec567a522eeb7ce19fe11c18e3c2' 
  AND token = 'HJ3qOu+r7yVotJ/qWukf6IZv8f+xMWZG+T5l1+dP55E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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