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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfdd6e414dd92a2fd19871e63eb614186ae8cae02c285d9935b936bfc3aed2aa' 
  AND token = 'S09XF/pzP1mCC/rCBE+a8ThksWETLu/DOKEyTWgRdAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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