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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '900b3a026d2cbc87de5a47707476366d149f1df7452edb57d9a3ed7d2fc3cb15' 
  AND token = 'O9ke90Dixn/h/qPoj7bJK1tPOw76R4MKSYFO5EVHawI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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