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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f70c644aa0378090c73ff6f5e130ef07431102bebc28dd95b59d35d281d694ce' 
  AND token = 'KFzLYYwU54EnltO29LzHXe00RB1xc1DaJ9Kf6J2tyu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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