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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0feea61ec5b024b3a57f47b1a9dd40eb7b5addb30b184dc951c71e36919d73bd' 
  AND token = 'BymW+BPuo9MWUtfxf781qRozk3uznTfKbVMaKPt3A94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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