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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42e2e286a40dad9b86f07e4d329d89d8851089ef48cd043f52605de8955041e9' 
  AND token = 'NcN92YNWp8f0Y+IAssUeodLNTLFD9IOVLtb/NCzR8nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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