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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebfe3545fff3222cc9062d3e384441d44740526df816a1cada1c58e14ceabe80' 
  AND token = 'vpXJ3llRjvFV/gWsE9y/MAgexlpjRtI1fkN3meFmK8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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