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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00ca1c5c7bf1e7b421b8c8728fa8525df420e01b6f9eb15adc6900b40d98a8aa' 
  AND token = 'j2AAriqBVsK+qLRkrHBe5+Q/VQW0tbvdDoIPyHlP3Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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