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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0615d521a9d65d55f80c262b50079a830841b83823e0a2c22d00c3427094f052' 
  AND token = '7+M/5WjoHnNjMCF8cOrcKF2YlJRTlxXx3Sp73ixCo0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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