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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '967343615f053e9d90a7f17c3cd34ccfde85526caa6293e4fd746a6fa31a1785' 
  AND token = '7a5/bAka50tNSzkZL0Zzx01FhYjnN2iLOQgZYlJWqqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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