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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b0eb050df848e01c26ef5a6f35e99fec508550a23246dda5e1fbe37e447d02a' 
  AND token = 'dbJLARMBqNDiFAa0R9J9czzZQp/3BobjihfSAT+iYSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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