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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f9422ac9eec14abf306af97d26479eb7fc974cac2e4fdf61f21ca1fa30d5ad4' 
  AND token = 'OBF5UJUSt8nIRygrgiVpoAodTMv7VPNS8z5PVaagOfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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