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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c91de27ef1cabbf1669542e103ad64a9ff734e2dc56eb67b907a551cf3ee8575' 
  AND token = 'IlltK7mfl+wH6CIE+Mljvuk4CJBeB72eOqvnX5k768w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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