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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99b8a0a258daf284702f98583efdf903b7a5a760d45cc2082bde8d105eeef72a' 
  AND token = 'Mdmc3bpBHjLOMt4l9L1SDFDy28ldppmcfXfChafPS9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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