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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '615c511bf16fd495a50e5a621b320f507c5a3271fecb8828de02a0486f634aed' 
  AND token = 'qclF/nf0CxVR/vSwI7JThRwygnLLpIvmnIysrTppNcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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