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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aad32db8916c17ce33586ed117fcd4e36f20fda613c70ecb9ffcc8a4bf81192a' 
  AND token = 'MAAnsI8E8LfmEHfAy5Sfle8sYMnBdVCNMAK8f+GxkKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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