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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c620b3f819c114f8679b895de82196c929454a6b999b8e20345296648a7ca080' 
  AND token = 'X2j4A0BllaTIfXTESpH8pHkNqbGiOhAtzwA9cP6RNh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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