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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6bc0988939ce40614950db35d84e327e418cd1253bd3e15b83ee830117b4885' 
  AND token = '32TF/66fKXctTtZiADh7Vsrer70Kuo5NukszJfniKB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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