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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e938f15f5a41961aea439aab986bea0bafd131f65aa8247c0454e37e3c9798e6' 
  AND token = 'vyO6pohcoG48E3lRXy/NKkoTwQMtQoetqlqm5/dUEgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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