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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71077ecf304a5ffe120a5313f3c4738af77e1f42f6fe22b398b0f7b8b8f2dac5' 
  AND token = 'CdmLNahs3eOSvaIZBbiIUxHnaN84i8Qcono5vYtriXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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