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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caa0a0329cec1ebc8b4bd89b48bf332b6a8424fdce42fa58817ca01237de0f2a' 
  AND token = 'sqPcupNPISSBF2VfB/H6zJ8gKWx/pZ4c2k62f6ptdR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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