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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea0a20268b7c5f6c804b039b4a748eb45bd6e90a323932a7a5ef721a8650f3a2' 
  AND token = 'EEk5BuxQqxUQ8v+kpMfDn2OPOtWlLBb7iTKYdLZ03O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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