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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '327e1ce5f311bf4135375ed3b7e485d45016ed10b244ca1c48ad0ecb7f938fc6' 
  AND token = 'OY9n01Qt9eaAvGhPQgtbFNY5C56alYQy6FYBvp+FNpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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