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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '126a6ffad435a94ce9b5ad51ecef6cc09cd7621bb2c5931d35703cd940f3c259' 
  AND token = 'lSVvpmo7wRe3mrrb5TF+jOhB3QxPhINRWYFK2SdeNOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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